- State.pm: Don't send an undefined value with irc_chan_mode when the
mode has no argument
- Console.pm: Improve the readability of the output, and show undef
- Deliver irc_plugin_error immediately, bypassing the event queue

- Join arguments to the 'quote' command with spaces. This allows us to
send commands with multiple arguments through the Console plugin.
- Add support for CAP command/replies. We use it to enable the server's
identify-msg feature when we connect.
- State.pm: In disconnected/error/socketerr events when no info is
available, make ARG1 an empty hash reference instead of undef.
- Console.pm: Don't send events to client before they're authed
- Console.pm: Pretty-print hash references

- Document the 'debug' parameter.
- Use Object::Pluggable instead of POE::Component::Pluggable. This smooths
out an inconsistency between plugins and normal sessions with regard to
events where extra arguments have been added.

- ISupport.pm: Don't send a premature irc_isupport event on networks
which send us numerics higher than 005 before the actual 005 (e.g Rizon)
- NickServID.pm: Send an 'irc_identified' event when we've identified with
NickServ. In addition, be a little more permissive when determining if
we have identified. Works with Rizon now.